ITunes Wifi sync has stopped working

iTunes has stopped syncing over wifi with my iPhone 5S and iPad Mini. It's always been a bit flaky, but has recently stopped working completely. iTunes will not see the devices unless I either reboot them, or plug them in with the Thunderbolt cable, deselect and select "sync with this device over wifi" and apply. If I try to use wifi sync, iTunes gives me a "looking for device" message and then drops the connection.
My set up is a Mac Pro running 10.10, hooked up to an Airport Express via Cat 6. Both iOS devices are on iOS 8.
I have tried changing the IPV6 settings on both my machine and my Airport Express, resetting the network settings on both iOS devices, and flushing my machine's DNS cache.
I see the following messages repeated in my system log:
10/17/14 10:51:03.004 PM iTunes[2424]: Entered:_AMMuxedDeviceDisconnected, mux-device:1
10/17/14 10:51:03.004 PM iTunes[2424]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:1
10/17/14 10:51:03.005 PM iTunes[2424]: tid:244b - BootedOS mode device disconnected
10/17/14 10:51:07.123 PM iTunes[2424]: Entered:_AMMuxedVersion2DeviceConnected, mux-device:2
10/17/14 10:51:07.140 PM iTunes[2424]: tid:244b - unable to query device capabilities
10/19/14 3:32:41.583 AM com.apple.usbmuxd[56]: HandleUSBMuxConnect Client 0x103c017d0-AppleMobileDeviceHelper/com.apple.SyncServices.AppleMobileDeviceHel per requesting attach to 0x4:62078 failed, no such device
10/19/14 3:32:41.583 AM AppleMobileDeviceHelper[15815]: AMDeviceConnect (thread 0x7fff74ccd300): Could not connect to lockdown port (62078) on device 4 - cda9592d30dad5b13a61189fdc7d7abebcb71eca: 0xe8000084.
10/19/14 3:32:41.660 AM AppleMobileDeviceHelper[15815]: 15815:1959580416|DeviceLinkListener.c:_copyMobileDeviceValue| ERROR: Could not connect to attached device: This device is no longer connected. (132)
10/19/14 3:32:41.660 AM AppleMobileDeviceHelper[15815]: 15815:1959580416|DeviceLinkListener.c:_setMobileDeviceValue| ERROR: Could not connect to attached device: This device is no longer connected. (132)
10/19/14 3:32:41.661 AM AppleMobileDeviceHelper[15815]: 15815:1959580416|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarge t| ERROR: Could not set tethered sync info ({
SyncingOS = iPhone;
}) in lockdown for com.apple.Bookmarks (Bookmarks): -402653052
10/20/14 12:16:38.119 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 1
10/20/14 12:16:38.119 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 2
10/20/14 12:16:38.119 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 3
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 4
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 5
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 6
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 7
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 8
10/20/14 12:16:38.120 AM discoveryd[53]: Basic Bonjour set up wake on resolve to b8:e8:56:cd:bb:10 on interface 9
10/20/14 12:26:50.255 AM iTunes[15786]: clip: empty path.
10/20/14 12:26:50.287 AM iTunes[15786]: clip: empty path.
10/20/14 12:26:50.334 AM iTunes[15786]: clip: empty path.
10/20/14 9:11:27.248 AM com.apple.usbmuxd[56]: _SendAttachNotification Device b8:e8:56:cd:bb:10@fe80::bae8:56ff:fecd:bb10._apple-mobdev2._tcp.local. has already appeared on interface 4. Suppressing duplicate attach notification.
10/20/14 9:11:29.048 AM iTunes[15786]: Entered:_AMMuxedDeviceDisconnected, mux-device:47
10/20/14 9:11:29.048 AM iTunes[15786]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:47
10/20/14 9:11:29.048 AM iTunes[15786]: tid:17e3f - Mux ID not found in mapping dictionary
b8:e8:56:cd:bb:10 is the wifi address of my iPhone.

Hi littlejimmym!
I have an article here for you that will help you troubleshoot this issue:
iTunes 10.5 and later: Troubleshooting iTunes Wi-Fi syncing
http://support.apple.com/kb/ts4062
Thanks for coming to the Apple Support Communities!
Cheers,
Braden

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